Question: What unit of measurement starts with the letter "v"?
Paraphrase: What unit of estimation begins with the letter "v"?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q47574 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'v')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: volt-ampere reactive, volt-ampere reactive, vector group, vector group, vacuum permittivity, vacuum permittivity, vRPM, vRPM, VArh, VArh, Vol, Vol, visus, visus, vertical metre, vertical metre, volt per metre, volt per metre, volt metre, volt metre